EP2515315A1 - Movable contact member and switch device using movable contact member - Google Patents
Movable contact member and switch device using movable contact member Download PDFInfo
- Publication number
- EP2515315A1 EP2515315A1 EP12157047A EP12157047A EP2515315A1 EP 2515315 A1 EP2515315 A1 EP 2515315A1 EP 12157047 A EP12157047 A EP 12157047A EP 12157047 A EP12157047 A EP 12157047A EP 2515315 A1 EP2515315 A1 EP 2515315A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cut
- movable contact
- contact member
- portions
- skirt portion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000008961 swelling Effects 0.000 claims abstract description 78
- 230000002093 peripheral effect Effects 0.000 claims abstract description 38
- 238000009751 slip forming Methods 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims description 8
- 230000004048 modification Effects 0.000 description 14
- 238000012986 modification Methods 0.000 description 14
- 238000007493 shaping process Methods 0.000 description 9
- 238000005520 cutting process Methods 0.000 description 6
- 239000002184 metal Substances 0.000 description 4
- 239000007769 metal material Substances 0.000 description 4
- 238000004904 shortening Methods 0.000 description 4
- 229920003002 synthetic resin Polymers 0.000 description 4
- 239000000057 synthetic resin Substances 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 239000000428 dust Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000008186 active pharmaceutical agent Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
- H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
- H01H13/78—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard characterised by the contacts or the contact sites
- H01H13/79—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard characterised by the contacts or the contact sites characterised by the form of the contacts, e.g. interspersed fingers or helical networks
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
- H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
- H01H13/702—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches
- H01H13/705—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches characterised by construction, mounting or arrangement of operating parts, e.g. push-buttons or keys
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H5/00—Snap-action arrangements, i.e. in which during a single opening operation or a single closing operation energy is first stored and then released to produce or assist the contact movement
- H01H5/04—Energy stored by deformation of elastic members
- H01H5/30—Energy stored by deformation of elastic members by buckling of disc springs
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
- H01H13/02—Details
- H01H13/26—Snap-action arrangements depending upon deformation of elastic members
- H01H13/48—Snap-action arrangements depending upon deformation of elastic members using buckling of disc springs
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2203/00—Form of contacts
- H01H2203/036—Form of contacts to solve particular problems
- H01H2203/05—Form of contacts to solve particular problems to avoid damage by deformation of layers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2209/00—Layers
- H01H2209/012—Layers avoiding too large deformation or stress
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2215/00—Tactile feedback
- H01H2215/034—Separate snap action
- H01H2215/036—Metallic disc
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2227/00—Dimensions; Characteristics
- H01H2227/026—Separate dome contact
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2227/00—Dimensions; Characteristics
- H01H2227/028—Key stroke
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2227/00—Dimensions; Characteristics
- H01H2227/036—Minimise height
Definitions
- a movable contact member that includes a swelling portion and a skirt portion.
- the swelling portion swells in the shape of a dome and operates reversely when pressed, and the skirt portion is continuously formed from an outer peripheral edge portion of the swelling portion.
- the skirt portion includes cut-out portions cut out at four portions thereof. Portions of the skirt portion except for the cut-out portions form contact portions.
- the cut-out portions of the skirt portion swell toward the swelling portion so that portions of the skirt portion except for the cut-out portions form portions to be grounded.
- a cut-out face shape of each of the cut-out portions is a linear shape or a gently curved shape when the skirt portion does not swell.
- plastic working (drawing) accompanied by swelling is performed after a flat plate material is cut (shaping) along the outer shapes of the skirt portion and the cut-out portions. Accordingly, it is possible to suppress the generation of cracks of the swelling portion or the generation of strain, deformation, or the like of the swelling portion, which is caused by cutting, as compared to a case where the shaping (cutting) of the skirt portion and the cut-out portions is performed after the drawing of the swelling portion.
- the four cut-out portions 32 are formed only at the skirt portion 12 so that the entire swelling portion 11 remains, and the skirt portion 12 is continuously formed from the peripheral edge portion 11a of the swelling portion 11. Accordingly, it is possible to reduce the concentration of stress on the cut-out portions 32 or the outer peripheral edge portion 11a at the time of the reverse operation of the movable contact member 1 as compared to a case where cut-out portions are formed at a part of a swelling portion or a case where legs are formed at a swelling portion (Japanese Unexamined Patent Application Publication No. 2005-332664 ).
- the cut-out outer shape OS where the cut-out face shapes PS extend and are connected to each other is a quadrangular shape (substantially square shape) in the movable contact member 1 according to the first embodiment of the invention, it is possible to distribute stress, which is generated at the cut-out portions 32 or the outer peripheral edge portion 11a, with a good balance at the time of the reverse operation of the movable contact member 1. Accordingly, it is possible to further suppress cracks generated at the movable contact member 1 and to further lengthen the life of the movable contact member 1.
- the skirt portion 12 includes the cut-out portions 32 cut out at four portions thereof and the skirt portion 12 is formed so as to continue to the peripheral edge portion 11a of the swelling portion 11. Accordingly, it is possible to reduce the concentration of stress on the cut-out portions 32 or the outer peripheral edge portion 11a at the time of the reverse operation of the movable contact member 1 as compared to a case where cut-out portions are formed at a part of a swelling portion or a case where legs are formed at a swelling portion (Japanese Unexamined Patent Application Publication No. 2005-332664 ).
- bent portions KK which are folded upward, may be formed at the skirt portion C22 as shown in Fig. 7B . Accordingly, it is possible to increase the stroke of a movable contact member C21.
Landscapes
- Push-Button Switches (AREA)
- Manufacture Of Switches (AREA)
Abstract
Description
- This application claims benefit of Japanese Patent Application No.
2011-095582 filed on April 22, 2011 - The present invention relates to a movable contact member and a switch device using the movable contact member, and more particularly, to a movable contact member that operates reversely when pressed and is connected to or disconnected from a contact and a switch device using the movable contact member.
- In general, a movable contact member, which operates reversely when pressed and is connected to or disconnected from a contact, is used as a movable contact member used in electronic devices, such as digital cameras and mobile phones, in order to obtain an operating force or an operating feeling such as a click feeling. A movable contact member, which is formed in the shape of a dome so as to have a predetermined curvature by working a thin metal plate, has been known.
- As the related art, in Japanese Unexamined Patent Application Publication No.
2000-348556 contact spring 811 where a plurality offeet 812 protrude from the outer periphery of a dome-shaped spring 804 and aswitch device 800 using thecontact spring 811 are proposed as shown inFig. 8A . Since thecontact spring 811 is provided with thefeet 812, the stroke of thecontact spring 811 shown inFig. 8A is larger than that of thecontact spring 844 according to a preceding example shown inFig. 8B at the time of the operation of the switch. - Further, since there is a demand for small switch devices as new electronic devices are being made small, the movable contact member has been made small. However, since the maximum outer shape of the dome has been increasingly made small as the movable contact member has been made small, there has been a problem in that a stroke at the time of the operation of a switch is not sufficiently obtained. In order to solve this problem, a
movable contact member 911 shown inFig. 9 , which includeslong legs 905, has been proposed in the related art (for example, see Japanese Unexamined Patent Application Publication No.2005-332664 shaped spring portion 904 and thelegs 905. Accordingly, the longer stroke is obtained by the increase of the length of thelegs 905. - However, if the
legs 905 are long as in themovable contact member 911 disclosed in Japanese Unexamined Patent Application Publication No.2005-332664 Fig. 9 , stress is concentrated on bent portions between the dome-shaped spring portion 904 and thelegs 905 and the reverse operation is repeated hundreds of thousands of times. For this reason, there has been a problem in that the life of the switch is shortened due to cracks generated at borders between thespring portion 904 and thelegs 905. Meanwhile, in order to lengthen the life of the switch, thefeet 812 may be made extremely short as in thecontact spring 811 disclosed in Japanese Unexamined Patent Application Publication No.2000-348556 Fig. 8A , or legs are not formed as in thecontact spring 844 according to the preceding example shown inFig. 8B at the time of the operation of a switch. However, as described above, there has been a problem in that the stroke is not sufficiently obtained. Further, when a contact spring having the shape of themovable contact member 911 disclosed in Japanese Unexamined Patent Application Publication No.2005-332664 Fig. 9 is used in a switch device that is generally produced in a square shape in order to increase the stroke, the maximum outer shape including the legs is larger than the maximum outer shape of the dome. For this reason, there also has been a problem in that the switch device may not be made small. - The invention provides a movable contact member of which the stroke can be increased without shortening the life of the movable contact member and which makes a switch device using the movable contact member small, and a switch device using the movable contact member.
- According to a first aspect of the invention, there is provided a movable contact member that includes a swelling portion and a skirt portion. The swelling portion swells in the shape of a dome and operates reversely when pressed, and the skirt portion is continuously formed from an outer peripheral edge portion of the swelling portion. The skirt portion includes cut-out portions cut out at four portions thereof. Portions of the skirt portion except for the cut-out portions form contact portions. The cut-out portions of the skirt portion swell toward the swelling portion so that portions of the skirt portion except for the cut-out portions form portions to be grounded. A cut-out face shape of each of the cut-out portions is a linear shape or a gently curved shape when the skirt portion does not swell.
- Further, according to a second aspect of the invention, in the movable contact member, among the four cut-out face shapes, the cut-out face shapes facing each other may be disposed at positions parallel to each other and the cut-out face shapes adjacent to each other may be disposed at positions orthogonal to each other.
- Furthermore, according to a third aspect of the invention, in the movable contact member, the skirt portion may be continuously formed from the outer peripheral edge portion of the swelling portion so as to substantially correspond to a tangential direction of a tangent extending in a radial direction of the dome at the outer peripheral edge portion of the swelling portion.
- Moreover, according to a fourth aspect of the invention, in the movable contact member, the skirt portion and the cut-out portions may be formed by performing plastic working accompanied by swelling after a flat plate material is cut along the outer shapes of the skirt portion and the cut-out portions.
- Further, according to a fifth aspect of the invention, there is provided a switch device that includes the movable contact member according to any one of the first to fourth aspects, a switch base, a central stationary contact, and peripheral stationary contacts. The switch base includes a receiving portion in which the movable contact member is received. The central stationary contact is provided in the receiving portion and connected to or disconnected from the swelling portion. The peripheral stationary contacts are provided in the receiving portion and come into electrical contact with at least one of the contact portions.
- According to the first aspect of the invention, in the movable contact member, the skirt portion includes the cut-out portions cut out at four portions thereof and the skirt portion is continuously formed from the outer peripheral edge portion of the swelling portion. Accordingly, it is possible to reduce the concentration of stress on the cut-out portions or the outer peripheral edge portion at the time of the reverse operation of the movable contact member as compared to a case where cut-out portions are formed at a part of a swelling portion or a case where legs are formed at a swelling portion (Japanese Unexamined Patent Application Publication No.
2005-332664 2000-348556 - According to the second aspect of the invention, in the movable contact member, among the four cut-out face shapes, the cut-out face shapes facing each other are disposed at positions parallel to each other and the cut-out face shapes adjacent to each other are disposed at positions orthogonal to each other in plan view. Accordingly, a cut-out outer shape where the cut-out face shapes extend and are connected to each other is a quadrangular shape (substantially square shape). For this reason, it is possible to distribute stress, which is generated at the cut-out portions or the outer peripheral edge portion, with a good balance at the time of the reverse operation of the movable contact member. Accordingly, it is possible to further suppress cracks generated at the movable contact member and to further lengthen the life of the movable contact member.
- According to the third aspect of the invention, in the movable contact member, the skirt portion is continuously formed from the outer peripheral edge portion of the swelling portion so as to substantially correspond to the tangential direction of a tangent extending in the radial direction of the dome. Accordingly, as compared to a case where the swelling portion and the skirt portion are connected to each other with inflection points, fulcrums at the time of the reversing of the swelling portion are not formed at the inflection points when the movable contact member operates reversely. Therefore, stress is not concentrated on the outer peripheral edge portion of the swelling portion. As a result, it is possible to further suppress the generation of cracks of the movable contact member caused by the concentration of stress, and to further lengthen the life of the movable contact member.
- According to the fourth aspect of the invention, in the movable contact member, plastic working (drawing) accompanied by swelling is performed after a flat plate material is cut (shaping) along the outer shapes of the skirt portion and the cut-out portions. Accordingly, it is possible to suppress the generation of cracks of the swelling portion or the generation of strain, deformation, or the like of the swelling portion, which is caused by cutting, as compared to a case where the shaping (cutting) of the skirt portion and the cut-out portions is performed after the drawing of the swelling portion.
- According to the fifth aspect of the invention, the switch device is a switch device using the movable contact member according to any one of the first to fourth aspects. Accordingly, a switch device of which the stroke is long and which can be made small is obtained. Further, since the life of the movable contact member is lengthened, it is also possible to lengthen the life of the switch device.
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Fig. 1 is a perspective view of a movable contact member according to a first embodiment of the invention; -
Fig. 2 is a view showing the movable contact member according to the first embodiment of the invention,Fig. 2A is a top view, andFig. 2B is a side view; -
Fig. 3 is a view showing the movable contact member according to the first embodiment of the invention,Fig. 3A is a cross-sectional view taken along a line III-III shown inFig. 2A , andFig. 3B is an enlarged cross-sectional view of a portion P shown inFig. 3A ; -
Fig. 4 is a perspective view of a switch device according to a second embodiment of the invention; -
Fig. 5 is an exploded perspective view of the switch device according to the second embodiment of the invention; -
Fig. 6 is a view showing the switch device according to the second embodiment of the invention,Fig. 6A is a top view of a switch base, andFig. 6B is a plan view showing that the movable contact member is placed on the switch base; -
Fig. 7 is a view showing a modification of the movable contact member according to the first embodiment of the invention,Fig. 7A is an enlarged cross-sectional view of a first modification of the enlarged cross-sectional view of the movable contact member shown inFig. 3B , andFig. 7B is an enlarged cross-sectional view of a second modification of the enlarged cross-sectional view shown inFig. 3B ; -
Fig. 8A is a top view of a switch device disclosed in Japanese Unexamined Patent Application Publication No.2000-348556 Fig. 8B is a top view of a switch device that shows a contact spring according to a preceding example disclosed in Japanese Unexamined Patent Application Publication No.2000-348556 -
Fig. 9 is a perspective view of a movable contact member disclosed in Japanese Unexamined Patent Application Publication No.2005-332664 - Embodiments of the invention will be described in detail below with reference to accompanying drawings.
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Fig. 1 is a perspective view of amovable contact member 1 according to a first embodiment of the invention.Fig. 2 is a view showing themovable contact member 1 according to the first embodiment of the invention,Fig. 2A is a top view, andFig. 2B is a side view.Fig. 3 is a view showing themovable contact member 1 according to the first embodiment of the invention,Fig. 3A is a cross-sectional view taken along a line III-III shown inFig. 2A , andFig. 3B is an enlarged cross-sectional view of a portion P shown inFig. 3A . - As shown in
Fig. 1 , themovable contact member 1 is formed of a conductive metal plate. Themovable contact member 1 includes a swellingportion 11 that operates reversely when pressed, and askirt portion 12 that is continuously formed from an outerperipheral edge portion 11a of the swellingportion 11. Accordingly, since theskirt portion 12 is formed so as to continue to an outerperipheral edge portion 11a of the swellingportion 11, theskirt portion 12 supports the swellingportion 11. - As shown in
Fig. 2 , the swellingportion 11 swells upward (in a Z1 direction shown inFig. 1 ) in the shape of a dome and is formed so as to be curved at a predetermined curvature in an area that corresponds to a circle having a predetermined diameter ϕ1 of the dome. Further, the swellingportion 11 is formed so as to be curved at a predetermined curvature even in an area between the circle having the predetermined diameter ϕ1 and the circle having the maximum diameter ϕ2 of the dome. - Further, the
skirt portion 12, which is formed so as to continue to the outerperipheral edge portion 11a of the swellingportion 11, is formed so as to be inclined at a predetermined angle. In this case, as shown inFigs. 2A, 2B , and3B , theskirt portion 12 is continuously formed from the outerperipheral edge portion 11a of the swellingportion 11 so as to substantially correspond to a tangential direction SD of a tangent extending in a radial direction DD of the dome at the outerperipheral edge portion 11a of the swellingportion 11. That is, since theskirt portion 12 is smoothly connected to the swellingportion 11, bent portions are not formed on the border between theskirt portion 12 and the swellingportion 11 and fulcrums at the time of the reversing of the swelling portion are not formed on the border. - Furthermore, as shown in
Figs. 1 to 3B , theskirt portion 12 includes cut-outportions 32 cut out at four portions facing each other with the swellingportion 11 interposed therebetween, and portions of theskirt portion 12 except for the cut-outportions 32form contact portions 52. Moreover, the cut-outportions 32 of theskirt portion 12 swell toward the swelling portion 11 (seeFig. 2B ) so that portions of theskirt portion 12 except for the cut-outportions 32 form portions capable of being grounded. Further, connectingportions 42 between the cut-outportions 32 and thecontact portions 52 of theskirt portion 12 are bent and connected. Furthermore, the maximum outer shape MS of thecontact portions 52 of theskirt portion 12 in plan view is a circular shape having a diameter ϕ3. Meanwhile, the shape of each of thecontact portions 52 of theskirt portion 12 is an arc shape but may be a linear shape. - As shown in
Fig. 2A , a cut-out face shape PS of each of the cut-outportions 32 in plan view is a linear shape. In particular, among the cut-out face shapes PS formed at all sides of the skirt portion, the cut-out face shapes PS facing each other are disposed at positions parallel to each other and the cut-out face shapes PS adjacent to each other are disposed at positions orthogonal to each other. Accordingly, a cut-out outer shape OS where the cut-out face shapes PS extend and are connected to each other is a quadrangular shape (substantially square shape). Moreover, a distance DS between a pair of cut-outportions 32 is larger than the maximum diameter ϕ2 of the dome of the swellingportion 11. The cut-out face shape PS of the first embodiment of the invention has been a substantially linear shape, but may be a gently curved shape. - In the
movable contact member 1 according to the first embodiment of the invention having the above-mentioned structure, the four cut-outportions 32 are formed only at theskirt portion 12 so that theentire swelling portion 11 remains, and theskirt portion 12 is continuously formed from theperipheral edge portion 11a of the swellingportion 11. Accordingly, it is possible to reduce the concentration of stress on the cut-outportions 32 or the outerperipheral edge portion 11a at the time of the reverse operation of themovable contact member 1 as compared to a case where cut-out portions are formed at a part of a swelling portion or a case where legs are formed at a swelling portion (Japanese Unexamined Patent Application Publication No.2005-332664 movable contact member 1 and to lengthen the life of themovable contact member 1. In addition, since theskirt portion 12 supports the swellingportion 11, it is possible to increase the stroke of themovable contact member 1 by theskirt portion 12 as compared to a case where legs are not formed or a case where legs are extremely short (Japanese Unexamined Patent Application Publication No.2000-348556 - Further, since the cut-out outer shape OS where the cut-out face shapes PS extend and are connected to each other is a quadrangular shape (substantially square shape) in the
movable contact member 1 according to the first embodiment of the invention, it is possible to distribute stress, which is generated at the cut-outportions 32 or the outerperipheral edge portion 11a, with a good balance at the time of the reverse operation of themovable contact member 1. Accordingly, it is possible to further suppress cracks generated at themovable contact member 1 and to further lengthen the life of themovable contact member 1. In addition, as compared to a case where long legs are formed at a swelling portion (Japanese Unexamined Patent Application Publication No.2005-332664 movable contact member 1 small and to make themovable contact member 1 compact without shortening the stroke of themovable contact member 1. - The cut-out outer shape OS has been formed so that the cut-out
portions 32 are disposed at the portion of theskirt portion 12 larger than the diameter ϕ2 of the dome of the swellingportion 11 and smaller than the diameter ϕ3 of the maximum outer shape MS of theskirt portion 12. However, it is preferable that the cut-outportions 32 be disposed near the middle between the diameter ϕ2 of the dome and the diameter ϕ3 of the maximum outer shape MS. For example, when the cut-outportions 32 are disposed near the diameter ϕ2 of the dome of the swellingportion 11, stress is apt to be concentrated due to the cut-outportions 32. For this reason, there is a concern that the life of themovable contact member 1 may be shortened. For example, when the cut-outportions 32 are disposed near the diameter ϕ3 of the maximum outer shape MS, the grounded portions of thecontact portions 52 of theskirt portion 12 become narrow. For this reason, there is a concern that thecontact portions 52 may not be uniformly grounded or a concern that the abrasion of a corresponding contact (for example, a stationary contact) may increase. - Further, in the
movable contact member 1 according to the first embodiment of the invention, theskirt portion 12 is continuously formed from the outerperipheral edge portion 11a of the swellingportion 11 so as to substantially correspond to the tangential direction SD of a tangent extending in the radial direction DD of the dome. Accordingly, as compared to a case where the swellingportion 11 and theskirt portion 12 are connected to each other with inflection points, fulcrums at the time of the reversing of the swelling portion are not formed at the inflection points when themovable contact member 1 operates reversely. Therefore, stress is not concentrated on the outerperipheral edge portion 11a of the swellingportion 11. As a result, it is possible to further suppress the generation of cracks of themovable contact member 1 caused by the concentration of stress, and to further lengthen the life of themovable contact member 1. - A method of manufacturing the
movable contact member 1 is a method of performing the shaping and drawing of a flat plate material, which is made of a metal material, by a press die. However, in the method, plastic working (drawing) accompanied by swelling is performed after the flat plate material is cut (shaping) along the outer shapes of theskirt portion 12 and the cut-outportions 32 at the beginning. Accordingly, it is possible to suppress the generation of cracks of the swellingportion 11 or the generation of the strain, deformation, or the like of the swellingportion 11, which is caused by cutting, as compared to a case where the shaping (cutting) of theskirt portion 12 and the cut-outportions 32 is performed after the drawing of the swellingportion 11. - Moreover, when the
skirt portion 12 does not swell, that is, when theskirt portion 12 has been subjected to shaping and is not yet subjected to drawing, the cut-out face shape PS of each of the cut-outportions 32 is a linear shape or a gently curved shape but it is preferable that the cut-out face shape PS of the cut-outportion 32 be a shape slightly bulging outward. Since the middle portion of the cut-out face shape PS of the cut-outportion 32 is curved toward the swellingportion 11 by the subsequent drawing, the reason why the cut-out face shape PS of each of the cut-outportions 32 is set to a shape slightly bulging outward is to make the cut-out outer shape OS after drawing be a quadrangular shape (substantially square shape). Accordingly, it is possible to distribute stress, which is generated at the cut-outportions 32 or the outerperipheral edge portion 11a, with a good balance at the time of the reverse operation of themovable contact member 1. Therefore, it is possible to further suppress cracks generated at themovable contact member 1 and to further lengthen the life of themovable contact member 1. - As described above, in the
movable contact member 1 according to the first embodiment of the invention, theskirt portion 12 includes the cut-outportions 32 cut out at four portions thereof and theskirt portion 12 is formed so as to continue to theperipheral edge portion 11a of the swellingportion 11. Accordingly, it is possible to reduce the concentration of stress on the cut-outportions 32 or the outerperipheral edge portion 11a at the time of the reverse operation of themovable contact member 1 as compared to a case where cut-out portions are formed at a part of a swelling portion or a case where legs are formed at a swelling portion (Japanese Unexamined Patent Application Publication No.2005-332664 movable contact member 1 and to lengthen the life of themovable contact member 1. In addition, since theskirt portion 12 supports the swellingportion 11, it is possible to increase the stroke of themovable contact member 1 by theskirt portion 12 as compared to a case where legs are not formed or a case where legs are extremely short (Japanese Unexamined Patent Application Publication No.2000-348556 movable contact member 1 of which the stroke is increased without the shortening of the life of themovable contact member 1. - Further, in plan view, among the cut-out face shapes PS formed at all sides of the skirt portion, the cut-out face shapes PS facing each other are disposed at positions parallel to each other and the cut-out face shapes PS adjacent to each other are disposed at positions orthogonal to each other. Accordingly, a cut-out outer shape OS where the cut-out face shapes PS extend and are connected to each other is a quadrangular shape (substantially square shape). For this reason, it is possible to distribute stress, which is generated at the cut-out
portions 32 or the outerperipheral edge portion 11a, with a good balance at the time of the reverse operation of themovable contact member 1. Therefore, it is possible to further suppress cracks generated at themovable contact member 1 and to further lengthen the life of themovable contact member 1. - Furthermore, the
skirt portion 12 is continuously formed from the outerperipheral edge portion 11a of the swellingportion 11 so as to substantially correspond to the tangential direction SD of a tangent extending in the radial direction DD of the dome. Accordingly, as compared to a case where the swellingportion 11 and theskirt portion 12 are connected to each other with inflection points, fulcrums at the time of the reversing of the swelling portion are not formed at the inflection points when themovable contact member 1 operates reversely. As a result, stress is not concentrated on the outerperipheral edge portion 11a of the swellingportion 11. Accordingly, it is possible to further suppress the generation of cracks of themovable contact member 1 caused by the concentration of stress, and to further lengthen the life of themovable contact member 1. - Moreover, plastic working (drawing) accompanied by swelling is performed after the flat plate material is cut (shaping) along the outer shapes of the
skirt portion 12 and the cut-outportions 32. Accordingly, it is possible to suppress the generation of cracks of the swellingportion 11 or the generation of the strain, deformation, or the like of the swellingportion 11, which is caused by cutting, as compared to a case where the shaping (cutting) of theskirt portion 12 and the cut-outportions 32 is performed after the drawing of the swellingportion 11. -
Fig. 4 is a perspective view of aswitch device 201 according to a second embodiment of the invention.Fig. 5 is an exploded perspective view of theswitch device 201 according to the second embodiment of the invention.Fig. 6 is a view showing theswitch device 201 according to the second embodiment of the invention,Fig. 6A is a top view of aswitch base 4, andFig. 6B is a plan view showing that themovable contact member 1 is placed on theswitch base 4. Further, the same components as the components of the first embodiment will be denoted by the same reference numerals, and the detailed description thereof will be omitted. - As shown in
Figs. 4 to 6 , theswitch device 201 according to the second embodiment of the invention includes themovable contact member 1 according to the first embodiment of the invention, aswitch base 4 including a receivingportion 14 in which themovable contact member 1 is received, a centralstationary contact 3 that is connected to or disconnected from the swellingportion 11 of themovable contact member 1, and peripheralstationary contacts 5 that come into electrical contact with at least one of thecontact portions 52 of themovable contact member 1. In addition, theswitch device 201 includes an operatingmember 6 that causes themovable contact member 1 to operate reversely by a pressing operation, and acover 9 that is mounted on theswitch base 4 covering the receivingportion 14 of theswitch base 4. - The
switch base 4 is made of an insulating material such as a synthetic resin, and is formed in the shape of a box which includes theconcave receiving portion 14 therein and of which the outer shape is a quadrangular shape and the upper surface is opened as shown inFigs. 4 to 6 . Themovable contact member 1 is placed in the receivingportion 14 as shown inFig. 6B so as to be received in the receivingportion 14. Further, since the shape of the receivingportion 14 is a quadrangular shape so as to correspond to the outer shape of themovable contact member 1, it is possible to make theswitch base 4 small as compared to a case where themovable contact member 911 disclosed in Japanese Unexamined Patent Application Publication No.2005-332664 switch device 201 with a small size. - As shown in
Fig. 6A , the centralstationary contact 3 made of a conductive metal material is disposed at the center of the inner bottom surface of the receivingportion 14 so that the upper surface of the centralstationary contact 3 is exposed to the outside. Accordingly, when themovable contact member 1 operates reversely by a pressing operation, the centralstationary contact 3 comes into electrical contact with the back side (the side corresponding to the Z2 side shown inFig. 5 ) of the swellingportion 11 of themovable contact member 1. Moreover, likewise, the peripheralstationary contacts 5 made of a conductive metal material are disposed at four corner positions on the inner bottom surface of the receivingportion 14 so that the upper surfaces of the peripheralstationary contacts 5 are exposed to the outside. When themovable contact member 1 is placed so as to be received in the receivingportion 14, the peripheralstationary contacts 5 come into electrical contact with at least one of thecontact portions 52 of themovable contact member 1. The disposition of the centralstationary contact 3 and the peripheralstationary contacts 5 into the receivingportion 14 of theswitch base 4 is simultaneously performed by insert molding when theswitch base 4 is formed. - Further, as shown in
Figs. 4 to 6 ,connection terminals 3a led out of the centralstationary contact 3 andconnection terminals 5c led out of the peripheralstationary contacts 5 are formed at two sides, which face each other, of the bottom wall of theswitch base 4, so as to protrude outward for the purpose of the connection to a circuit board of a device or the like. - The operating
member 6 is made of, for example, a synthetic resin material, includes aconvex operating portion 6s to be pressed as shown inFigs. 4 and5 , and is disposed on the upper side (Z1 side) of themovable contact member 1. When the operatingportion 6s is pressed, the swellingportion 11 of themovable contact member 1 disposed on the lower side (Z2 side) is pushed. Accordingly, it is possible to make themovable contact member 1 be reversely operated. - The
cover 9 is produced using, for example, a metal plate, and is formed in the shape of a substantially square plate in top view. Further, a largeoperation opening portion 9k through which theoperating portion 6s of the operatingmember 6 is exposed to the outside is formed at the center of thecover 9 as shown inFigs. 4 and5 . Furthermore, L-shapedlocking pawls 19 are formed at the four corners of thecover 9. The lockingpawls 19 are engaged withpositioning protrusions 4t formed on theswitch base 4, so that thecover 9 is positioned on theswitch base 4 from front to back and from side to side. Meanwhile, thecover 9 has been produced by performing the pressing (shaping, punching, and the like) of a metal plate. However, thecover 9 is not limited to a metal material and may be produced by injection molding with a synthetic resin material. - Since the
switch device 201 according to the second embodiment of the invention having the above-mentioned structure is formed using themovable contact member 1 according to the first embodiment of the invention, aswitch device 201 of which the stroke is long and which can be produced with a small size is obtained. Further, since the life of themovable contact member 1 is lengthened, it is also possible to lengthen the life of theswitch device 201. - Meanwhile, the invention is not limited to the above-mentioned embodiments, and may be modified, for example, as described below. These embodiments also pertain to the scope of the invention.
-
Fig. 7 is a view showing a modification of themovable contact member 1 according to the first embodiment of the invention,Fig. 7A is an enlarged cross-sectional view of a first modification of the enlarged cross-sectional view of themovable contact member 1 shown inFig. 3B , andFig. 7B is an enlarged cross-sectional view of a second modification of the enlarged cross-sectional view shown inFig. 3B . - In the above-mentioned embodiments, the grounded portions of the
contact portions 52 of themovable contact member 1 have been formed linearly and inclined. However, grounded portions of contact portions C62 may be curved as shown inFig. 7A . For this reason, it is possible to reduce the abrasion of peripheralstationary contacts 5 and the contact portions C62 that is caused by the repetition of the reverse operation of a movable contact member C11. Accordingly, it is possible to further lengthen the life of the switch device. - In the above-mentioned embodiments, the
skirt portion 12 of themovable contact member 1 where thecontact portions 52 have been formed linearly and inclined. However, bent portions KK, which are folded upward, may be formed at the skirt portion C22 as shown inFig. 7B . Accordingly, it is possible to increase the stroke of a movable contact member C21. - Several small convex protrusions may be formed on the back side (the side coming into contact with the central stationary contact 3) of the swelling
portion 11 of themovable contact member 1 according to the above-mentioned embodiment. For this reason, it is possible to reliably make the movable contact member and the centralstationary contact 3 come into contact with each other without affecting the reverse operation of the movable contact member, and to reduce contact failures caused by abrasion powder. Accordingly, the life of the movable contact member and the switch device using the movable contact member is lengthened. - In the above-mentioned embodiments, the connecting portions 42 (see
Fig. 2B ) between the cut-outportions 32 and thecontact portions 52 of theskirt portion 12 have been bent and connected. However, it is more preferable that the connectingportions 42 be moderately connected. Accordingly, stress applied to the connecting portions is reduced, so that it is possible to lengthen the life of themovable contact member 1. - A film made of a synthetic resin having flexibility may be disposed between the
movable contact member 1 and the operatingmember 6 of the second embodiment so as to cover the receivingportion 14. It is possible to prevent dust from escaping from the receivingportion 14 of themovable contact member 1, to prevent dust from entering the receivingportion 14, or to prevent static electricity by the film. - In the second embodiment, the operating
member 6 has been used to make themovable contact member 1 operate reversely. However, themovable contact member 1 may be directly pushed by a finger without the operatingmember 6. - The invention is not limited to the above-mentioned embodiments, and may have various modifications without departing from the scope of the invention.
- It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and alterations may occur depending on design requirements and other factors insofar as they are within the scope of the appended claims or the equivalents thereof.
Claims (5)
- A movable contact member comprising:a swelling portion (11) that swells in the shape of a dome and operates reversely when pressed; anda skirt portion (12 or C22) that is continuously formed from an outer peripheral edge portion (11a) of the swelling portion,wherein the skirt portion includes cut-out portions (32) cut out at four portions thereof,
portions of the skirt portion except for the cut-out portions form contact portions (52 or C62),
the cut-out portions of the skirt portion swell toward the swelling portion so that portions of the skirt portion except for the cut-out portions form portions to be grounded, and
a cut-out face shape (PS) of each of the cut-out portions is a linear shape or a gently curved shape when the skirt portion does not swell. - The movable contact member according to claim 1, wherein among the four cut-out face shapes, the cut-out face shapes facing each other are disposed at positions parallel to each other and the cut-out face shapes adjacent to each other are disposed at positions orthogonal to each other.
- The movable contact member according to claim 1 or 2, wherein the skirt portion is continuously formed from the outer peripheral edge portion of the swelling portion so as to substantially correspond to a tangential direction (SD) of a tangent extending in a radial direction (DD) of the dome at the outer peripheral edge portion of the swelling portion.
- The movable contact member according to claim 3, wherein the skirt portion and the cut-out portions are formed by performing plastic working accompanied by swelling after a flat plate material is cut along the outer shapes of the skirt portion and the cut-out portions.
- A switch device comprising:the movable contact member (1, C11, or C21) according to any one of claims 1 to 4;a switch base (4) including a receiving portion (14) in which the movable contact member is received;a central stationary contact (3) that is provided in the receiving portion and connected to or disconnected from the swelling portion; andperipheral stationary contacts (5) that are provided in the receiving portion and come into electrical contact with at least one of the contact portions.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2011095582A JP5717249B2 (en) | 2011-04-22 | 2011-04-22 | Movable contact member and switch device using the movable contact member |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2515315A1 true EP2515315A1 (en) | 2012-10-24 |
EP2515315B1 EP2515315B1 (en) | 2016-05-04 |
Family
ID=45930551
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12157047.7A Active EP2515315B1 (en) | 2011-04-22 | 2012-02-27 | Movable contact member and switch device using movable contact member |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2515315B1 (en) |
JP (1) | JP5717249B2 (en) |
CN (1) | CN102751110B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3916747A4 (en) * | 2019-01-23 | 2022-03-16 | Panasonic Intellectual Property Management Co., Ltd. | Movable member and input device |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6471076B2 (en) * | 2015-10-14 | 2019-02-13 | アルプス電気株式会社 | Push switch and keyboard using it |
WO2018159047A1 (en) * | 2017-02-28 | 2018-09-07 | パナソニックIpマネジメント株式会社 | Push switch |
EP3734627B1 (en) * | 2017-12-26 | 2023-10-11 | Panasonic Intellectual Property Management Co., Ltd. | Movable contact point, switch with movable contact point, and embossed tape for containing movable contact point |
Citations (8)
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US3796843A (en) * | 1973-01-02 | 1974-03-12 | Bomar Instr Corp | Calculator keyboard switch with disc spring contact and printed circuit board |
FR2432205A1 (en) * | 1978-07-28 | 1980-02-22 | Rode Stucky | Pushbutton switch esp. for calculators and tv controls - has sprung snap action with electrode of shallow pyramidal shape |
DE3520211A1 (en) * | 1985-06-05 | 1986-12-11 | Elektronikus Mérökészülékek Gyára, Budapest | Switching element having three contact points |
EP0538199A2 (en) * | 1991-10-14 | 1993-04-21 | Fela Mikrotechnik Ag | Electrical push botton switch |
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JPS62171126U (en) * | 1986-04-18 | 1987-10-30 | ||
FR2728813A1 (en) * | 1995-01-04 | 1996-07-05 | Nicomatic | PROCESS FOR THE MANUFACTURE OF FLAT PARTS, AND FLAT PARTS FORMED THEREBY |
JP3077360U (en) * | 2000-10-30 | 2001-05-18 | 宏鈞 王 | Mobile phone key chip |
JP3753676B2 (en) * | 2002-05-31 | 2006-03-08 | 不二電子工業株式会社 | switch |
JP4704890B2 (en) * | 2004-11-08 | 2011-06-22 | 株式会社フジクラ | Diaphragm for switch |
US7301113B2 (en) * | 2004-11-08 | 2007-11-27 | Fujikura Ltd. | Diaphragm for use in switch, method for manufacturing thereof, membrane switch, and input device |
JP4617229B2 (en) * | 2005-09-14 | 2011-01-19 | 株式会社フジクラ | Push button switch |
JP2008181897A (en) * | 2008-04-16 | 2008-08-07 | Alps Electric Co Ltd | Push-button switch |
JP5347818B2 (en) * | 2009-08-06 | 2013-11-20 | ミツミ電機株式会社 | Domed spring and switch |
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2011
- 2011-04-22 JP JP2011095582A patent/JP5717249B2/en active Active
-
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- 2012-02-27 EP EP12157047.7A patent/EP2515315B1/en active Active
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US3796843A (en) * | 1973-01-02 | 1974-03-12 | Bomar Instr Corp | Calculator keyboard switch with disc spring contact and printed circuit board |
FR2432205A1 (en) * | 1978-07-28 | 1980-02-22 | Rode Stucky | Pushbutton switch esp. for calculators and tv controls - has sprung snap action with electrode of shallow pyramidal shape |
DE3520211A1 (en) * | 1985-06-05 | 1986-12-11 | Elektronikus Mérökészülékek Gyára, Budapest | Switching element having three contact points |
EP0538199A2 (en) * | 1991-10-14 | 1993-04-21 | Fela Mikrotechnik Ag | Electrical push botton switch |
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JP2000348556A (en) | 1999-06-02 | 2000-12-15 | Citizen Electronics Co Ltd | Contact spring and switch using the same |
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EP3916747A4 (en) * | 2019-01-23 | 2022-03-16 | Panasonic Intellectual Property Management Co., Ltd. | Movable member and input device |
Also Published As
Publication number | Publication date |
---|---|
JP5717249B2 (en) | 2015-05-13 |
CN102751110B (en) | 2015-10-28 |
JP2012227071A (en) | 2012-11-15 |
EP2515315B1 (en) | 2016-05-04 |
CN102751110A (en) | 2012-10-24 |
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